Dierks
film movement preventing means

ABSTRACT

A CAMERA RECEIVES PERFORATED ROLL FILM IN A CARTRIDGE HAVING A SURFACE ACROSS WHICH THE FILM IS ADVANCED AND A RECESS IN THE SURFACE IN GENRAL ALIGNMENT WITH THE FILM PERFORATIONS. THE CAMERA INCLUDES A FILM ADVANCE MECHANISM AND MEANS FOR SELECTABLY DISABLING THE FILM ADVANCE MECHANISM. A FILM PERFORATION SENSING PAWL RESTS AGAINST THE FILM SURFACE TO FALL INTO A PERFORATION OF THE ADVANCING FILM AND TO BE MOVED THEREBY AGAINST THE FORCE OF A SPRING UNTIL THE SENSING PAWL REACHES A PREDETERMINED POSITION WHEREAT THE DISABLING MEANS IS ACTIVATED TO DISABLE THE FILM BACKWARD MECHANISM. THE SIDE LOAD ON THE FILM FROM THE SPRING FORCE ON THE SENSING PAWL TENDS TO PUSH THE FILM BACKWARD ALONG THE EXPOSURE PLANE, THEREBY TENDING TO CAUSE UNDERSIRED FILM MOVEMENT DURING AN EXPOSURE. A MEMBER OR DART FIXED IN THE CAMERA PROJECTS ACROSS THE CAMERA&#39;&#39;S EXPOSURE PLANE IN THE REGION OF THE RECESS OF A RECEIVED CARTRIDGE FOR DEPRESSING THE FILM INTO THE RECESS TO PREVENT SUCH UNDESIRED FILM MOVEMENT. THE RELATIONSHIP OF THE DART AND THE RECESS PERMITS FILM ADVANCEMENT IN ONE DIRECTION BUT PREVENTS FILM MOVEMENT IN THE OPPOSED DIRECTION.

EFENSWE PUBHEATEON UNITED STATES PATENT OFFICE Published at the requestof the applicant or owner in accordance with the Notice of Dec. 16,1969, 869 O.G. 687. The abstracts of Defensive Publication applicationsare identified by distinctly numbered series and are arrangedchronologically. The heading of each abstract indicates the number ofpages of specification, including claims and sheets of drawingscontained in the application as originally filed. The files of theseapplications are available to the public for inspection and reproductionmay be purchased for 30 cents a sheet.

Defensive Publlcatlon applications have not been examined as to themerits of alleged invention. The Patent Ofiice makes no assertion us tothe novelty of the disclosed subject matter.

PUBLISHED MARCH 5, 1974 T920,011 FILM MOVEMENT PREVENTING MEANS James E.Dierks, Rochester, NY. Continuation of abandoned application Ser. No.316,639, Dec. 19, 1972, which is a continuation of application Ser. No.217,803, Jan. 14, 1972. This application June 28, 1973, Ser. No. 374,726

Int. Cl. G03b 19/04 US. C]. 95-31 FM 1 Sheet Drawing. 7 PagesSpecification A camera receives perforated roll film in a cartridgehaving a surface across which the film is advanced and a recess in thesurface in general alignment with the film perforations. The cameraincludes a film advance mechanism and means for selectably disabling thefilm advance mechanism. A film perforation sensing pawl rests againstthe film surface to fall into a perforation of the advancing film and tobe moved thereby against the force of a spring until the sensing pawlreaches a predetermined position whereat the disabling means isactivated to disable the film advance mechanism. The side load on thefilm from the spring force on the sensing pawl tends to push the filmbackward along the exposure plane, thereby tending to cause undesiredfilm movement during an exposure. A member or dart fixed in the cameraprojects across the cameras exposure plane in the region of the recessof a received cartridge for depressing the film into the recess toprevent such undesired film movement. The relationship of the dart andthe recess permits film advancement in one direction but prevents filmmovement in the opposed direction.

March 5, 1974 J. E. DIERKS FILM MOVEMENT PREVENTING MEANS Original FiledJan. 14, 1972

